dynamodb-invisible-costs-span-ttl-and-capacity-overhead

Status: OUT

DynamoDB has multiple independent invisible cost mechanisms operating simultaneously: TTL deletes appear free locally but consume WCU on global table replicas (with no CloudTrail visibility), while capacity billing has hidden per-item overhead (100 bytes indexing, rounding penalties, GSI minimums) that disproportionately penalizes the small items TTL is most commonly applied to — the two invisible mechanisms compound on the same workload pattern.

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